Insulator



FIG. 1 is a right side perspective view of an insulator showing my newdesign;

FIG. 2 is a right side view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a rear view thereof;

FIG. 6 is a bottom view thereof; and,

FIG. 7 is a top view thereof.

The broken line portion of FIG. 1 showing a post apparatus is includedto show unclaimed subject matter only and forms no part of the claimeddesign.

I claim the ornamental design for an insulator, as shown and described.